Papers by Keyword: Zinc Oxide (ZnO)

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Authors: Yutaka Adachi, Naoki Ohashi, Isao Sakaguchi, Takeo Osawa, Haruki Ryoken, Hideki Yoshikawa, Shigenori Ueda, Keisuke Kobayashi, Hajime Haneda
Abstract: (Mg,Zn)O films were grown on Zn- and O-face ZnO single crystal substrates by pulsed laser deposition. The surface morphologies of the films grown on the Zn- and O-face substrates were quite different, indicating that no domain inversion occurred in both films. The films showed markedly different features for valence band spectra obtained by hard X-ray photoemission spectroscopy. This suggests that the effect of film polarity should be considered in X-ray photoemission spectroscopy.
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Authors: Siti Nor Qurratu Aini Abd Aziz, Swee Yong Pung, Zainovia Lockman, Nur Atiqah Hamzah, Yim Leng Chan
Abstract: An ultraviolet (UV) shielding agent based on Fe-doped zinc oxide nanorods (ZnONRs) was synthesized by ex-situdoping using spray pyrolysis technique. These Fe-doped ZnO NRs could reduce the inherent photocatalytic activity of zinc oxide while still maintaining their ultraviolet filtering capability. In this work, the effect of doping duration by spray pyrolysis technique on the optical property and photocatalytic efficiency of ZnO NRs was studied. The room temperature photoluminescence (PL) analysis on the Fe-doped ZnO NRs indicates the red-shift of violet emission peak, i.e. from 378.97 nm (undoped) to 381.86 nm (60 mins.doping). Besides, the reduction of IUV/Vis ratio of PL reveals that the ex-situ Fe doping deteriorated the crystal quality of ZnO NRs. The photocatalytic study shows that the rate constant of Fe-doped ZnO NRs was smaller than the undoped ZnO NRs. It means that the Fe-doped ZnO NRs were less effective in degrading the RhB solution.
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Authors: Yi Su, Xiao Ping Zou, Xiang Min Meng, Gong Qing Teng
Abstract: Two-dimensional ZnO nanostructures with various morphologies were synthesized on aluminum by solution method at 90°C. In our experiment, 0.1M zinc chloride (ZnCl2) was used as a ZnO precursor, and different volume of ammonia solution (25%) was added to the solution. We characterize the morphology and nanostructure of 2-D ZnO nanostructures and study the growth mechanisms of these 2-D structures. It should be noted that the existence of Cl﹣ plays an important role on the formation of 2-D structures.
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Authors: A. Chaouch, Tioursi Mustapha
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Authors: Tron Min Chen, Kai Ming Uang, Hao Xiang Chen, Shu Kuo Lin
Abstract: In this study, we report the fabrication and characterization of a novel nanohetero junction structure (NHJ) UV photodetectors (PDs) on flexible polyethylene terephthalate (PET). The ZnO nanowires (NWs) were grown by 2-step hydrothermal growth (HTG) onto p-type nickel oxide (p-NiO) film deposited PET flexible substrate. For enhancing the quality and reliability of the fabricated UV PDs, the PET substrate was treated with a beforehand thermosetting process to refine its toughness and flatness. By switching the illumination UV light “on” and “off”, the fabricated UV PDs biased under-5 V have an on-off current ratio of 16. After over 100 times 90o bend, the transient measurement almost has the same reversibility but on-off current ratio reducing to 10. These results suggest that the proposed n-ZnO-NWs/p-NiO NHJs on PET flexible PET substrate not only have a fairly good response to UV light but also have good endurance within suitable bend. The present optoelectronic UV sensor would provide an effective and simple way for future developments of flexible optoelectronic devices.
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Authors: Jue Zhong, Peter Mascher, Werner Puff, A.H. Kitai
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Authors: Ying Mo Hu, Qing Ling Wang, Jing Bian
Abstract: The synthetic methods that starch graft copolymerized with lactic acid have been preliminary studied with catalysis of ordinary chemical reagents by one-step, and the structure of starch/lactic acid graft copolymer was characterized by IRH-NMRXRD and SEM et al. The experimental results show that sodium hydroxide (NaOH), zinc oxide (ZnO) and stannous chloride (SnCl2) so on can catalyze the graft copolymerization of starch with lactic acid successfully, it will provide a simple synthetic process to prepare starch/lactic acid graft copolymer.
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Authors: A.N. Afaah, Zuraida Khusaimi, Mohamad Rusop
Abstract: This paper presents a review on synthesis, structure, and growth mechanisms of one-dimensional nanostructures of ZnO. Solution-based method is a potential deposition technique for large-scale production as its advantages; the low cost, the simplicity of experimental set-up, and the low operating temperature. Mist-atomiser technique is one of the solution-based methods in synthesizing optimized ZnO nanostructures. Doping will lead for better properties of ZnO, which result to wide application area. Nanostructured ZnO is important in promising areas of application which devices utilizing nanostructures such as gas sensors and solar cells, since it is fairly easy to fabricate such forms of ZnO nanostructures, which have good charge carrier transport properties and high crystalline quality.
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Authors: Yuh Chung Hu, David T.W. Lin, Hai Lin Lee, Pei Zen Chang
Abstract: The effect of Zinc-Oxide (ZnO) thin film annealed in different ambiences is presented. To achieve low cost and environmentally friendly process, ZnO aqueous solution is synthesized by dissolving zinc acetate dihydrate in deionized water directly. Zinc oxide aqueous solution of high solubility and stability is presented. High quality and dense Zinc oxide thin film is formed by spin coating. Annealing temperatures are in the range of 300 °C~500 °C, and annealing ambiences of both air and N2 are discussed.
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Authors: Pedro Barquinha, Elvira Fortunato, Alexandra Gonçalves, Ana Pimentel, António Marques, Luís Pereira, Rodrigo Martins
Abstract: The purpose of this work is to present in-depth electrical characterization on transparent TFTs, using zinc oxide produced at room temperature as the semiconductor material. Some of the studied aspects were the relation between the output conductance in the post-pinch-off regime and width-to-length ratios, the gate leakage current, the semiconductor/insulator interface traps density and its relation with threshold voltage. The main point of the analysis was focused on channel mobility. Values extracted using different methodologies, like effective, saturation and average mobility, are presented and discussed regarding their significance and validity. The evolution of the different types of mobility with the applied gate voltage was investigated and the obtained results are somehow in disagreement with the typical behavior found on classical silicon based MOSFETs, which is mainly attributed to the completely different structures of the semiconductor materials used in the two situations: while in MOSFETS we have monocrystalline silicon, our transparent TFTs use poly/nanocrystalline zinc oxide with grain sizes of about 10 nm.
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